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Effects of Packer Locations on Downhole Electric Heater Performance: Experimental Test and Economic Analysis

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  • Wei Guo

    (College of Construction Engineering, Jilin University, Changchun 130021, China
    National-Local Joint Engineering Laboratory of In-situ Conversion, Drilling and Exploitation Technology for Oil Shale, Jilin University, Changchun 130021, China
    Key Lab of Ministry of Natural Resources for Drilling and Exploitation Technology in Complex Conditions, Jilin University, Changchun 130021, China)

  • Zhendong Wang

    (College of Construction Engineering, Jilin University, Changchun 130021, China
    National-Local Joint Engineering Laboratory of In-situ Conversion, Drilling and Exploitation Technology for Oil Shale, Jilin University, Changchun 130021, China
    Key Lab of Ministry of Natural Resources for Drilling and Exploitation Technology in Complex Conditions, Jilin University, Changchun 130021, China)

  • Youhong Sun

    (National-Local Joint Engineering Laboratory of In-situ Conversion, Drilling and Exploitation Technology for Oil Shale, Jilin University, Changchun 130021, China
    Key Lab of Ministry of Natural Resources for Drilling and Exploitation Technology in Complex Conditions, Jilin University, Changchun 130021, China
    China University of Geosciences, Beijing 100083, China)

  • Xiaoshu Lü

    (College of Construction Engineering, Jilin University, Changchun 130021, China
    National-Local Joint Engineering Laboratory of In-situ Conversion, Drilling and Exploitation Technology for Oil Shale, Jilin University, Changchun 130021, China
    Department of Electrical Engineering and Energy Technology, University of Vaasa, FIN-65200 Vaasa, Finland
    Department of Civil and Structural Engineering, School of Engineering, Aalto University, P.O. Box 12100, FIN-02015 Espoo, Finland)

  • Yuan Wang

    (College of Construction Engineering, Jilin University, Changchun 130021, China
    National-Local Joint Engineering Laboratory of In-situ Conversion, Drilling and Exploitation Technology for Oil Shale, Jilin University, Changchun 130021, China
    Key Lab of Ministry of Natural Resources for Drilling and Exploitation Technology in Complex Conditions, Jilin University, Changchun 130021, China)

  • Sunhua Deng

    (College of Construction Engineering, Jilin University, Changchun 130021, China
    National-Local Joint Engineering Laboratory of In-situ Conversion, Drilling and Exploitation Technology for Oil Shale, Jilin University, Changchun 130021, China
    Key Lab of Ministry of Natural Resources for Drilling and Exploitation Technology in Complex Conditions, Jilin University, Changchun 130021, China)

  • Qiang Li

    (College of Construction Engineering, Jilin University, Changchun 130021, China
    National-Local Joint Engineering Laboratory of In-situ Conversion, Drilling and Exploitation Technology for Oil Shale, Jilin University, Changchun 130021, China
    Key Lab of Ministry of Natural Resources for Drilling and Exploitation Technology in Complex Conditions, Jilin University, Changchun 130021, China)

Abstract

A downhole electric heater, which reduces heat loss along a heat insulation pipe, is a key apparatus used to ignite oil shale underground. Downhole heaters working together with packers can improve the heating efficiency of high-temperature gases, while different packer locations will directly affect the external air temperature of the heater shell and, subsequently, the performance and total cost of the downhole heaters. A device was developed to simulate the external conditions of heater shells at different packer locations. Then, the effects of external air temperature on the performance of a downhole heater with pitches of 50, 160, and 210 mm were experimentally studied. In the test, results indicated that the heater with a packer at its outlet had an accelerated heating rate in the initial stage and decreased temperature in the final stage. Additionally, the lowest heating rod surface temperature and highest comprehensive performance were achieved with minimal irreversible loss and lower total cost when using a downhole electric heater with a packer set at its outlet. In addition, the downhole electric heater with a helical pitch of 50 mm and a packer at its outlet was more effective than other schemes in the high Reynolds number region. These findings are beneficial for shortening the oil production time in oil shale in situ pyrolysis and heavy oil thermal recovery.

Suggested Citation

  • Wei Guo & Zhendong Wang & Youhong Sun & Xiaoshu Lü & Yuan Wang & Sunhua Deng & Qiang Li, 2020. "Effects of Packer Locations on Downhole Electric Heater Performance: Experimental Test and Economic Analysis," Energies, MDPI, vol. 13(2), pages 1-17, January.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:2:p:377-:d:308065
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    References listed on IDEAS

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